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107 lines
3.7 KiB
107 lines
3.7 KiB
/*
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* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.lang.model.util;
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import javax.lang.model.element.*;
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import javax.annotation.processing.SupportedSourceVersion;
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import static javax.lang.model.SourceVersion.*;
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import javax.lang.model.SourceVersion;
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/**
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* A visitor of program elements based on their {@linkplain
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* ElementKind kind} with default behavior appropriate for the {@link
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* SourceVersion#RELEASE_8 RELEASE_8} source version. For {@linkplain
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* Element elements} <tt><i>XYZ</i></tt> that may have more than one
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* kind, the <tt>visit<i>XYZ</i></tt> methods in this class delegate
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* to the <tt>visit<i>XYZKind</i></tt> method corresponding to the
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* first argument's kind. The <tt>visit<i>XYZKind</i></tt> methods
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* call {@link #defaultAction defaultAction}, passing their arguments
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* to {@code defaultAction}'s corresponding parameters.
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*
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* <p> Methods in this class may be overridden subject to their
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* general contract. Note that annotating methods in concrete
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* subclasses with {@link java.lang.Override @Override} will help
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* ensure that methods are overridden as intended.
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*
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* <p> <b>WARNING:</b> The {@code ElementVisitor} interface
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* implemented by this class may have methods added to it or the
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* {@code ElementKind} {@code enum} used in this case may have
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* constants added to it in the future to accommodate new, currently
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* unknown, language structures added to future versions of the
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* Java™ programming language. Therefore, methods whose names
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* begin with {@code "visit"} may be added to this class in the
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* future; to avoid incompatibilities, classes which extend this class
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* should not declare any instance methods with names beginning with
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* {@code "visit"}.
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*
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* <p>When such a new visit method is added, the default
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* implementation in this class will be to call the {@link
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* #visitUnknown visitUnknown} method. A new abstract element kind
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* visitor class will also be introduced to correspond to the new
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* language level; this visitor will have different default behavior
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* for the visit method in question. When the new visitor is
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* introduced, all or portions of this visitor may be deprecated.
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*
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* <p>Note that adding a default implementation of a new visit method
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* in a visitor class will occur instead of adding a <em>default
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* method</em> directly in the visitor interface since a Java SE 8
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* language feature cannot be used to this version of the API since
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* this version is required to be runnable on Java SE 7
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* implementations. Future versions of the API that are only required
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* to run on Java SE 8 and later may take advantage of default methods
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* in this situation.
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*
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* @param <R> the return type of this visitor's methods. Use {@link
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* Void} for visitors that do not need to return results.
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* @param <P> the type of the additional parameter to this visitor's
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* methods. Use {@code Void} for visitors that do not need an
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* additional parameter.
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*
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* @see ElementKindVisitor6
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* @see ElementKindVisitor7
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* @since 1.8
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*/
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@SupportedSourceVersion(RELEASE_8)
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public class ElementKindVisitor8<R, P> extends ElementKindVisitor7<R, P> {
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/**
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* Constructor for concrete subclasses; uses {@code null} for the
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* default value.
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*/
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protected ElementKindVisitor8() {
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super(null);
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}
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/**
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* Constructor for concrete subclasses; uses the argument for the
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* default value.
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*
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* @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
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*/
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protected ElementKindVisitor8(R defaultValue) {
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super(defaultValue);
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}
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}
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